Automatic complete equipment for pole-mounted vacuum circuit breaker

Abstract

The utility model discloses automatic complete equipment for a pole-mounted vacuum circuit breaker, and relates to the technical field of power distribution networks. The device comprises an on-site unit which comprises a power supply side three-phase five-column voltage transformer, a column vacuum circuit breaker and a load side voltage transformer, and the on-site unit is connected with an overhead line; and the processing unit comprises a connection loop, a power distribution network single-phase earth fault protector and a feeder automation control terminal, and the power distribution network single-phase earth fault protector is connected with the field unit through the connection loop, collects current and voltage signals of the overhead line and transmits the current and voltage signals to the feeder automation control terminal. The single-phase earth fault protector for the power distribution network has the beneficial effects that the single-phase earth fault protector acquires signals of an overhead line through the connection loop, judges the single-phase earth fault, can effectively solve the problem that the single-phase earth fault is difficult to identify, and is matched with a feeder automation control terminal to improve the working efficiency. And switching-on and switching-off of the switch and FTU standby remote signaling displacement signals are sent to the distribution network automation master station in a control manner.

Description

Technical Field

[0001] The utility model relates to the technical field of distribution networks, and particularly to an automatic complete set of equipment for pole-mounted vacuum circuit breakers. Background Art

[0002] For the automatic complete set of equipment used in the 10KV distribution line of the acquisition controller, the recognition of single-phase grounding faults mostly adopts the zero-sequence current mutation method, and generally there are the following situations:

[0003] 1. In a small current grounding system of the neutral point, since the grounding fault current is relatively small, it is difficult to set the zero-sequence current value, and most equipment is in the zero-sequence withdrawal state.

[0004] 2. In a system where the neutral point is grounded through a small resistor, as Figure 1 shown, the zero-sequence current Io = Uc / (Rz + Rd + Rx), where Rz is the neutral point grounding resistor, Rd is the grounding transition resistor, and Rz is the line impedance (generally ignored). For example, when the neutral point grounding resistor is 10 ohms, when the grounding transition resistor is greater than the action value of 50A, and when the grounding transition resistor is greater than 100 ohms, the generated zero-sequence current is already less than 50A. The generated zero-sequence current cannot reach the action value set by the feeder automation control terminal (FTU). At this time, when the substation recognizes that the zero-sequence voltage of the bus exceeds the alarm value and pulls the circuit one by one to find the faulty line, it will cause power outages of non-faulty lines or non-faulty sections, increasing the number of power outages (frequent power outages).

[0005] Generally, the configuration of the automatic complete set of equipment for pole-mounted vacuum circuit breakers used in distribution networks includes: a vacuum circuit breaker, a three-phase five-column PT (on the power supply side), a three-phase five-column PT (on the load side), a single-phase PT, and a feeder automation control terminal FTU. The use of a single-phase grounding fault protector for the distribution network can isolate single-phase grounding faults nearby and locally without the need for the substation to trip, effectively improving the power supply reliability. However, there is still a lack of a product that directly combines the single-phase grounding fault protector for the distribution network and the feeder automation control terminal. Summary of the Utility Model

[0006] The purpose of this part is to outline some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this part, as well as in the abstract and the title of the utility model of this application, to avoid obscuring the purpose of this part, the abstract, and the title of the utility model. However, such simplifications or omissions cannot be used to limit the scope of the utility model.

[0007] Therefore, the problem to be solved by the utility model is how to accurately and effectively identify single-phase grounding faults and perform data interaction with the distribution network automation master station.

[0008] To solve the above technical problems, the present utility model provides the following technical solutions: An automatic complete set of equipment for a pole-mounted vacuum circuit breaker, including a field unit, which includes a power-side three-phase five-column voltage transformer, a pole-mounted vacuum circuit breaker, and a load-side voltage transformer, and the field unit is connected to an overhead line; a processing unit, which includes a connection circuit, a distribution network single-phase grounding fault protector, and a feeder automation control terminal. The distribution network single-phase grounding fault protector is connected to the field unit through the connection circuit, collects the current and voltage signals of the overhead line, and then transmits them to the feeder automation control terminal.

[0009] As a preferred solution of the automatic complete set of equipment for the pole-mounted vacuum circuit breaker of the present utility model, wherein: the connection circuit includes a current connection circuit, a voltage connection circuit, a control connection circuit, a telemetry connection circuit, and a power supply connection circuit.

[0010] As a preferred solution of the automatic complete set of equipment for the pole-mounted vacuum circuit breaker of the present utility model, wherein: the bottom of the distribution network single-phase grounding fault protector is provided with a first current aviation socket and a second current aviation socket. The first current aviation socket is connected to the third current aviation socket on the pole-mounted vacuum circuit breaker through the current connection circuit, and the second voltage aviation socket is connected to the fourth current aviation socket on the feeder automation control terminal through the current connection circuit.

[0011] As a preferred solution of the automatic complete set of equipment for the pole-mounted vacuum circuit breaker of the present utility model, wherein: the bottom of the distribution network single-phase grounding fault protector is further provided with a first voltage aviation socket and a second voltage aviation socket. The first voltage aviation socket is connected to the third voltage aviation socket on the power-side three-phase five-column voltage transformer through the voltage connection circuit, and the second voltage aviation socket is connected to the fourth voltage aviation socket on the feeder automation control terminal through the voltage connection circuit.

[0012] As a preferred solution of the automatic complete set of equipment for the pole-mounted vacuum circuit breaker of the present utility model, wherein: the bottom of the distribution network single-phase grounding fault protector is provided with a first control aviation socket and a second control aviation socket. The first control aviation socket is connected to the pole-mounted vacuum circuit breaker through the control connection circuit, and the second control aviation socket is connected to the fourth control aviation socket on the feeder automation control terminal through the control connection circuit.

[0013] As a preferred solution of the automatic complete set of equipment for the pole-mounted vacuum circuit breaker of the present utility model, wherein: the bottom of the distribution network single-phase grounding fault protector is further provided with a first telemetry aviation socket. The first telemetry aviation socket is connected to the second telemetry aviation socket on the feeder automation control terminal through the telemetry connection circuit.

[0014] As a preferred embodiment of the on-pole vacuum circuit breaker automatic complete equipment of the present utility model, wherein: a first power aviation socket is further arranged on the feeder automation control terminal, and the first power aviation socket is connected to the power aviation socket on the load side voltage transformer through a power connection loop.

[0015] As a preferred embodiment of the on-pole vacuum circuit breaker automatic complete equipment of the present utility model, wherein: the feeder automation control terminal includes a triode, a telecontrol relay and a PM terminal. The base of the triode is connected to the FZ_J1 port of the CPU, the collector of the triode is connected to the 1st and 2nd contacts of the telecontrol relay, and the 1st and 2nd contacts of the telecontrol relay are connected to the PM terminal.

[0016] The beneficial effects of the on-pole vacuum circuit breaker automatic complete equipment of the present utility model: the single-phase grounding fault protector of the distribution network collects the current and voltage signals of the overhead line through the above connection loop, discriminates the single-phase grounding fault, can effectively solve the problem of difficult identification of single-phase grounding faults, and cooperates with the feeder automation control terminal to send the switch opening and closing and the FTU standby telecontrol signal change signals to the distribution network automation master station control. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to these drawings. Among them:

[0018] Figure 1 is the schematic diagram of the neutral point grounded through a small resistance system in the prior art;

[0019] Figure 2 is the overall architecture diagram of the on-pole vacuum circuit breaker automatic complete equipment of the present utility model;

[0020] Figure 3 is the schematic diagram of the connection loop of the on-pole vacuum circuit breaker automatic complete equipment of the present utility model;

[0021] Figure 4 is the telecontrol circuit diagram of the on-pole vacuum circuit breaker automatic complete equipment of the present utility model. Detailed Embodiments

[0022] In order to make the above objects, features and advantages of the present utility model more obvious and understandable, the following will make a detailed description of the specific embodiments of the present utility model in conjunction with the drawings of the specification.

[0023] In the following description, numerous specific details are set forth to provide a thorough understanding of the present utility model. However, the present utility model may also be implemented in other ways different from those described herein. Persons skilled in the art may make similar extensions without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0024] Secondly, the so-called "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation manner of the present utility model. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it an individual or selectively exclusive embodiment with other embodiments.

[0025] Embodiment 1

[0026] Referring to Figure 2 and Figure 3 , this is the first embodiment of the present utility model. This embodiment provides an automated complete set of equipment for a pole-mounted vacuum circuit breaker, including a field unit 100, which includes a power-side three-phase five-column voltage transformer 101, a pole-mounted vacuum circuit breaker 102, and a load-side voltage transformer 103. The field unit 100 is connected to the overhead line; a processing unit 200, which includes a connection circuit 201, a distribution network single-phase grounding fault protector 202, and a feeder automation control terminal 203. The distribution network single-phase grounding fault protector 202 is connected to the field unit 100 through the connection circuit 201 and collects the current and voltage signals of the overhead line, and then transmits them to the feeder automation control terminal 203.

[0027] The connection circuit 201 includes a current connection circuit 201a, a voltage connection circuit 201b, a control connection circuit 201c, a telemetry signal connection circuit 201d, and a power supply connection circuit 201e.

[0028] At the bottom of the distribution network single-phase grounding fault protector 202, there are a first current aviation socket 202a and a second current aviation socket 202b. The first current aviation socket 202a is connected to the third current aviation socket 102a on the pole-mounted vacuum circuit breaker 102 through the current connection circuit 201a. The second voltage aviation socket 202d is connected to the fourth current aviation socket 203a on the feeder automation control terminal 203 through the current connection circuit 201a.

[0029] At the bottom of the single-phase grounding fault protector 202 of the distribution network, there are also a first voltage aviation socket 202c and a second voltage aviation socket 202d. The first voltage aviation socket 202c is connected to the third voltage aviation socket 101a on the three-phase five-column voltage transformer 101 on the power supply side through the voltage connection circuit 201b, and the second voltage aviation socket 202d is connected to the fourth voltage aviation socket 203b on the feeder automation control terminal 203 through the voltage connection circuit 201b.

[0030] At the bottom of the single-phase grounding fault protector 202 of the distribution network, there are a first control aviation socket 202e and a second control aviation socket 202f. The first control aviation socket 202e is connected to the pole-mounted vacuum circuit breaker 102 through the control connection circuit 201c, and the second control aviation socket 202f is connected to the fourth control aviation socket 203c on the feeder automation control terminal 203 through the control connection circuit 201c.

[0031] The fourth control aviation socket 203c is the input and output control aviation socket of the feeder automation control terminal 203.

[0032] At the bottom of the single-phase grounding fault protector 202 of the distribution network, there is also a first telemetry signal aviation socket 202g. The first telemetry signal aviation socket 202g is connected to the second telemetry signal aviation socket 203d on the feeder automation control terminal 203 through the telemetry signal connection circuit 201d.

[0033] On the feeder automation control terminal 203, there is also a first power supply aviation socket 203e. The first power supply aviation socket 203e is connected to the power supply aviation socket 103a on the load-side voltage transformer 103 through the power supply connection circuit 201e.

[0034] The current and voltage signals of the overhead line are collected through the above connection circuits. The single-phase grounding fault protector of the distribution network discriminates the single-phase grounding fault and controls the opening / closing of the pole-mounted vacuum circuit breaker on the external overhead line.

[0035] Embodiment 2

[0036] Refer to Figure 4 , which is the second embodiment of the present invention. Different from the previous embodiment, this embodiment provides a feeder automation control terminal 203, including a triode Q3, a telemetry signal relay K3, and a PM terminal. The base of the triode Q3 is connected to the FZ_J1 port of the CPU, the collector of the triode Q3 is connected to the 1 and 2 contacts of the telemetry signal relay K3, and the 1 and 2 contacts of the telemetry signal relay K3 are connected to the PM terminal.

[0037] The model of the telemetry signal relay K3 is selected as PCH-124D2H, and the model of the triode Q3 is selected as MMBT5551.

[0038] Signal control connection between the single-phase grounding fault protector 202 and the feeder automation control terminal 203 provided by the present utility model: After the single-phase grounding fault protector 202 of the distribution network discriminates a single-phase grounding fault, the CPU issues a tripping instruction through the FZ_J1 port, the telecontrol relay K3 is energized and its normally open contacts 3 and 4 are closed, and the internal standby telecontrol terminal of the feeder automation control terminal 203 is connected to the common terminal through the PM terminal to send a telecontrol position change signal to the distribution network automation master station.

[0039] When a single-phase grounding fault occurs in the distribution network line, the single-phase grounding fault protector of the distribution network identifies the grounding fault and issues a tripping instruction, and the switch trips. At this time, the FTU identifies the switch trip and sends an SOE event record (switch trip) to the distribution network automation master station. In order to enable the staff of the distribution network automation master station to judge the reason for the trip, two normally open contact leads of the tripping relay are led out from the single-phase grounding fault protector of the distribution network and connected to the common terminal and the standby terminal of the incoming telecontrol of the FTU. When a fault occurs, the standby telecontrol terminal is connected, and a telecontrol position change signal is sent to the distribution network automation master station. The staff of the distribution network automation master station changes the position display to "single-phase grounding", and then they can clearly know that it is the single-phase grounding fault protector of the distribution network that has operated, and proceed with subsequent fault analysis and processing (it is necessary to cooperate to open the standby telecontrol of the FTU).

[0040] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and not to limit them. Although the present utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present utility model can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present utility model, and they should all be covered by the scope of the claims of the present utility model.

Claims

1. An automatic complete set of equipment for pole-mounted vacuum circuit breakers, characterized in that: including a field unit (100), including a power-side three-phase five-column voltage transformer (101), a pole-mounted vacuum circuit breaker (102), and a load-side voltage transformer (103), where the field unit (100) is connected to an overhead line; a processing unit (200), including a connection loop (201), a distribution network single-phase grounding fault protector (202), and a feeder automation control terminal (203), where the distribution network single-phase grounding fault protector (202) is connected to the field unit (100) through the connection loop (201) to collect current and voltage signals of the overhead line and then transmit them to the feeder automation control terminal (203).

2. The pole-mounted vacuum circuit breaker automatic complete equipment according to claim 1, characterized in that: The connection loop (201) includes a current connection loop (201a), a voltage connection loop (201b), a control connection loop (201c), a telemetry connection loop (201d), and a power supply connection loop (201e).

3. The pole-mounted vacuum circuit breaker automatic complete equipment according to claim 2, characterized in that: At the bottom of the distribution network single-phase grounding fault protector (202), there are a first current aviation socket (202a) and a second current aviation socket (202b). The first current aviation socket (202a) is connected to a third current aviation socket (102a) on the pole-mounted vacuum circuit breaker (102) through the current connection loop (201a), and the second current aviation socket (202b) is connected to a fourth current aviation socket (203a) on the feeder automation control terminal (203) through the telemetry connection loop (201d).

4. The pole-mounted vacuum circuit breaker automatic complete equipment according to claim 3, characterized in that: At the bottom of the distribution network single-phase grounding fault protector (202), there are also a first voltage aviation socket (202c) and a second voltage aviation socket (202d). The first voltage aviation socket (202c) is connected to a third voltage aviation socket (101a) on the power-side three-phase five-column voltage transformer (101) through the voltage connection loop (201b), and the second voltage aviation socket (202d) is connected to a fourth voltage aviation socket (203b) on the feeder automation control terminal (203) through the voltage connection loop (201b).

5. The pole-mounted vacuum circuit breaker automatic complete equipment according to claim 4, characterized in that: At the bottom of the distribution network single-phase grounding fault protector (202), there are a first control aviation socket (202e) and a second control aviation socket (202f). The first control aviation socket (202e) is connected to the pole-mounted vacuum circuit breaker (102) through the control connection loop (201c), and the second control aviation socket (202f) is connected to a fourth control aviation socket (203c) on the feeder automation control terminal (203) through the control connection loop (201c).

6. The pole-mounted vacuum circuit breaker automatic complete equipment according to claim 5, characterized in that: At the bottom of the distribution network single-phase grounding fault protector (202), there is also a first telemetry aviation socket (202g). The first telemetry aviation socket (202g) is connected to a second telemetry aviation socket (203d) on the feeder automation control terminal (203) through the telemetry connection loop (201d).

7. The on-pole vacuum circuit breaker automatic complete equipment according to any one of claims 2-6, characterized in that: A first power aviation socket (203e) is further provided on the feeder automation control terminal (203), and the first power aviation socket (203e) is connected to a power aviation socket (103a) on the load side voltage transformer (103) through a power connection loop (201e).

8. The pole-mounted vacuum circuit breaker automatic complete equipment according to claim 7, characterized in that: The feeder automation control terminal (203) includes a triode (Q3), a telecontrol relay (K3) and a PM terminal. The base of the triode (Q3) is connected to the FZ_J1 port of the CPU. The collector of the triode (Q3) is connected to the 1 and 2 contacts of the telecontrol relay (K3), and the 1 and 2 contacts of the telecontrol relay (K3) are connected to the PM terminal.

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